15% of Americans Have German Ancestry
11 percent of the U.S. population claim Irish descent and the highest concentration can be found in Ocean City, New Jersey. The Irish potato famine brought around 4.5 million Irish people to American shores. 22 U.S. presidents were of Irish descent and famous Irish Americans include John F. Kennedy and Neil Armstrong. Mexican ancestry follows close behind at 10.58 percent. Americans with Mexican ancestry are most concentrated in Laredo, Texas and notable people include Joan Baez, Eva Longoria and Jessica Alba.
This chart shows the highest ancestral concentration in U.S./metro areas in 2014